– International Truck and Engine Corporation, a Navistar company, has introduced its mid-range I-6 family of MaxxForce International Diesel Power engines for 2008-model-year trucks, and provided specifications and technical details. Built on International’s I-6 architecture, the MaxxForce DT, MaxxForce 9, and MaxxForce 10 serve as the next level of International diesel engines.
The MaxxForce DT, MaxxForce 9, and MaxxForce 10 diesel engines feature precision-machined sleeves for even cylinder cooling and no hot spots, resulting in cylinders that stay round during thermal expansion to provide increased engine durability for the customer, according to International.
The crankcase for the I-6 engines features six head bolts per cylinder, which provides even clamping for head-gasket life. Bearing-cap ladder reinforcement provides added strength for high horsepower ratings. Four valves per cylinder allow the engines to breathe easier for better performance and lower emissions and to reduce vavletrain wear.
With a works kit from International, the engines can be returned to original factory specifications for less than the cost of remanufacturing, according to International.
Other MaxxForce I-6 engine features include:
An upgraded EGR system reduces NOx without sacrificing fuel economy due to increased EGR cooling, improved EGR mixing, higher flow rates, and reduced pressure drop.
Closed-crankcase ventilation system with a centrifugal oil mist separator has no filters to change.
A new intake throttle helps raise exhaust temperature for active regeneration of the diesel particulate filter and protects it from high-temperature damage.
The MaxxForce DT powers Class 6-8 International DuraStar and WorkStar trucks, as well as IC school and commercial buses with 210-300 horsepower and 560-860 ft.-lbs of torque.
The MaxxForce 9 powers Class 7-8 DuraStar and WorkStar commercial trucks and the International CXT with 300-330 hp and 800-950 ft.-lbs. of torque. The MaxxForce 10 powers Class 8 International WorkStar and TranStar trucks with 310-350 hp and 1,050-1,150 ft.-lbs. of torque.
Beginning in January, MaxxForce engines become the signature powerplant for International brand on-highway Class 4-8 commercial vehicles. In North America, the MaxxForce product line ranges from the upgraded 4.5L V-6 MaxxForce 5 to the new MaxxForce 13 big-bore Class 8 engine. Another highlight is the all-new 6.4L MaxxForce 7.